martin



G. W. MARTIN. Making Rubber Articles.

Pand m28, 1868.

n. i when I glatten faire lstnt @trig GEORGE vin-MARTIN, Or BOSTON,MASSAOH'USETTS, ASSIGNOR TO HIMSELF AND J. W. HASKINS, OF SAME PLAGE.

Letterman# No. 80,299, dated Juzg, 28, 1868,

IMPROVEMENT IN THE MANUEAGTURE 0F ARTICLES 0F SOI'T -RUBBER.

TO ALL WHOM 1T MAY OONOERN'.

Be it known that I, GEORGE W. MARTIN, Lof Boston, in the county ofSuolk,`and State of Massachusetts, have invented a new and useful Improvementin the Manufacture of Articles in Rubber; and I- do hereby declarethefollowing to be a full, clear, and exact description of the same,reference being had 4tothe accompanyin'g drawings, which are made partof this specification. y i

I have discovered that elastic screw-threads may-be produced bysubjecting soft rubberto a process of heating, moulding, and pressing.

vI thus produce elastic screw-threads, the chief purpose of which is tosecures.` joint which shall be'eiective in preventing the passagethrough it of air, steam, gas, or liquid. Thus the elasticthreads may beapplied til a rubber coupling for metallic tubing, or to rubber tubinghaving a. metallic coupling. y A

The elastic ,threads are especially applicable to caps and stoppers forjars, cans, nndbottls, but theinvenltion is not confined to such uses,as it will be found' useful as applied to bolts and nuts, and, in fact,in a great. variety of instances,r where screw-threads are formed uponmetal, wood, &c. i p

A joint formed wholly or partially of elastic screw-threads isadvantageous on account of tightness, freedoin from rust, flexibility,lightness', and'that qualityof rubber which prevents the threads frombeing crushed. or torn olf by forcible friction.'

In the drawings- Figure 1 may represent an inkstand or fruit-jar withthe threads upon its neck, and Figure 5 is a correspondingly-threadedcap adapted thereto.

Figure 2 may represent a bottle-stopper of elastic rubber, whoseinternal chamber mav be filled` with -a core of some suitable hardsubstance.

.Figure 3 a bolt, with a nut having elastic screw-threads, and

Figure 4, two pipe-sections and a coupling illustrating the invention. i

The elastic threads maybe formed with and upon'articles of rubber, butthey may be formed separately,` and afterwards applied to articles nfmetal, wood, or other hard material.

Having thus described my invention, what I claim as new herein,and-desire to secure by Letters'Patent, is-l- An elastic screw-thread,substantially as described.

To the above vI have-signed my name, this 2d day of June,1868.'

' Witnesses:

JOHN A. WIEDERSHEIM, JACOB HENRY.

GEO. W. MARTIN.

